AM79514 datasheet(11/18 Pages) AMD

11 / 18 page

SLIC Products

Table 1.

SLIC Decoding

DET Output

State

C3 C2 C1

Two-Wire Status

E1 = 0

E1 = 1

Open Circuit

Ring trip

Ringing

Ring trip

Active

Loop detector

Ground key

On-hook TX (OHT)

Loop detector

Ground key

Tip Open

Loop detector

—

Reserved

Loop detector

—

Active Polarity Reversal

Loop detector

Ground key

OHT Polarity Reversal

Loop detector

Ground key

Table 2.

User-Programmable Components

Where ZT is connected between the VTX and RSN pins. The

fuse resistors are RF, and Z2WIN is the desired 2-wire AC input

impedance. When computing ZT, the internal current amplifier

pole and any external stray capacitance between VTX and

RSN must be taken into account.

Where ZRX is connected from VRX to the RSN pin, ZT is defined

above, G42L is the desired receive gain, and ZL is the 2-wire

load impedance.

Where RDC1, RDC2, and CDC form the network

CDC = (1.5 ms)(RDC1 + RDC2)/(RDC1 • RDC2) connected to the

RDC pin. RDC1 and RDC2 are approximately equal.

Where RD and CD form the network connected from RD to –5V

and IT is the threshold current between on hook and off hook.

1000 Z

2WIN

–

()

42L

-----------

1000

•

1000 Z

()

----------------------------------------------------

•

DC 1

DC2

2500

FEED

-------------

365

---------

0.5 ms

-----------------

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